Amplifying-case for microtelephones.



W. B. O'LIVER. AMPLIFYI NG CASE FOR MICROTELEPHONES.

. APPLIOATIUN PILED sBPT. 30, 1910.

1,0783746. Patented Nov. 18, 1913.

WILLIAM B. omvEnJ'or coLLmGswoon, NEW James.V

AMPLIFYINGLCASE Fon MIGROTEEPHOES.

lots-,746,

Speeification of ette'rs Patent.

Patented Nov. 18; 1913.

Applicatl'omflled September 30,11910, Serial N'o'. 584,633:

To all whom t may oncern:

Be it' known that I, WILLIAM B; OLIVER, of Collingswood, in the countyof Camden and State of New Jersey, have invented certain new and usefulImprovements in- Amplifying-Cases for Microt'elephones, whereof thefollowing is a specification, reference being had'to the accompanyingdrawings.

My improvements relate to portable cases for mierotelephones, as forinstance, those used to assist the hearing of`the deaf. .By

' my invention, I provide such a portable case,

which not'only securely holds and protects all of the elements ofthemicrotelephone, but

also includes an amplifying chamber,'whicl1 may. be' employed whendesire'd in connection with the transmitter. At the same time all partsof the instrument may be removed from the case and usedlindependentlythereof.

Heretofore it has been usual to provide microtele'phones forconversational use, in

which the transmitter is capable of beingv attached to the person,- thebattery' placed within the pocket and the receiver held by the hand tothe ears, all with proper wiring connections. It has likewise been usualto provide for use in public assemblies an entirely vseparateinstrument'with the parts permanently placed in a case and with anamplifying Chamber formed in thev case always in proper relation to thetransmitter. My present invent1on makes it unnecessary to possess twoseparate instruments for these two uses, because the same worklng` partsare by my inventlon made capable of use under both conditions, that iseither for conwersational or for aud1tor1um purposes.

In a convenient embodiment of my invention, the amplifying' Chamber isprovided with a closure in the form of a swivcled shutter,!wliei'e)y theChamber may at times be used,'aslia closed receptacle for any part ofthe ltelfephone, as for instance, the recciver, with' the additionalfunction when the amplifying chamber is in use, of pro- Viding a readymeans for controlling the volume of .sound reaching the ti'ansmit-ter byadjustment of the swinging shutter at its month. ln other respects mycase provides a ncat and simple means for'securely protecting and easilycarrying the elements of a microtelephone.

In the accompanying (lrawing's, Figure I, is a perspective view of anamplifying case,

embodying my' invention, the case being 'artially opened to exposethebat'tery chamer. Fig. II', is a longitudinal Vertical section' ofthe' same, with the receiver shown within the amplifyin'g case, where itis ordinarily carried. Fig. III, is an end elevation of the case seen inF ig. II.

My amplifying case comprises a rece' tacie' 1, generally'cylindrical inshape, Wit in which is cformed the conical amplifying Chamber 22 In theregion of the small end of'the amplifying ehamber', there is formedl anauxiliary chamber 3, of suitable size and shape to conveniently receivethe transmitter 4, which when packed within this chamber occupies aproper position, with relation to the amplifying chamber to receive andtransmit the amplified sound Waves` assing therethrough, This auxiliarycham er for the transmitter is closed by a suitable' lid 5, preferablyannular in Shape, leaving a central sound're'ceiving aperture, andwhich.

maybe conveniently held in place by fastening devices 7, 7, as shown.Thus the Chamber and its lid are so arranged that the transmitter may beeasily and quiekly removed from the case, and the whole instrument putinto use independently thereof- Below the parts thus described areadditional receptacles 8, and 9, in the former of which may be placedthe hand switch, and in the latter, the battery elements of thelmicrotelephone. This latter receptacle is closed by the flap 10,suitable openings or slits being provided to permit the cords of themicrotelephone to pass from ,eompartmentI to compartment.

The fiaring end of the amplifying compartment is closed and protected bya swing'- ing shutter 12, which is swiveled cent-rally upon; pivots 13,13. In its closed position, it is held in place by a flap 15, with afastener 16, in which condition the amplifying chamher afords aconvenicnt receptacle for the receiver of the microtelephone, but whenused as an amplifying Chamber, the receiver having been removed and theswinging shutter nnloosed from its fastening, the shutter op- (u'ates asa regulating shutter, increasing or decrcasing' the aperture of theamplifying chambcr according to the angle at which' it rcsts. This is animportant consideration, as under certain conditions of use, anamplifyingl` chamber, such as I have shown, may cause the sound to bemagnified to a disagreeable extent, unless its function is regulated andmodified by the means which I v have described.

used in any convenient nianner. It Will be noted in removing the partsof the microtelephone entn'ely from the case, there is no -disturbanceof the electrical connections or other intcrference with their`functions; Wh en the elements of the microtele hone are desired to beused in connect-ion wit the amplifying Chamber, the battery andtransmitter remain in place, 'only the receivei' being removed from thecase, and applied to the ear. In this condition the case may be held inthe lap or stood upon a table, with the amplifying' Chamber in properrelation to the traveling sound waves, the entrance of which is thensubject to regulation by manipulation of the shutter as described.

Having thus described my invcntion, I claim l. A microtelephone providedwith a case containing receptacles for the functional parts of themicrotelephone including a special r'eceptacle for the transmitter, andan amplifying Chamber in such position in the case that the trausmitterwhen inserted in its receptacle is in proper coincidenoe with theamplifying chamber; electrical connections between said functionalparts; and means whereby all such functional parts are lremovable fromsaid case Without disturbance of their electric connections orfunctions.

2. In a portahle microtelephone, the combination with a receptaclefitted with a transmitter and an amplifying chambe'r; a shutterfitted'within, but lar'ge-enoughto completely close the month of theamplifying Chamber, said shutter being pivoted within the amplifyingChamber on a traiisverse axis, whereby saidishutter may be adjusted Whenopened to vary the aperture and to regulate the eX- tent to which theamplifying chamber magnifies the sound Waves.

In test'imony Whereof, I have hereunto' signed my name at Philadelphia,Pennsylvania, this tWenty-seventh day of September, 1910.

WILLIAM B. CLIVER.

Vitnesses JAMns H. BELL, E. L. FULLER'YON.

